rails                   
                                          
                                          
  
                                          
  
                                          
                                          
 trains  are  so  constructed  that  they 
 have  to follow a set path. this path is 
 called a "railway",  which is  comprised 
 of two metal  rails, hence its nickname. 
                                          
 because  the  low friction  between  the 
 wheels of the  train and the rail metal, 
 there are limits  for how acute  a curve 
 can be, and even more  so for  how  much 
 the  ground  under  the   rails  can  be 
 sloped. thus a railway is often not  led 
 on top  of hills, rather through them in 
 tunnels   (if   they   are  large),   or 
            artificial chasms.            
                                          
 there will be trees  on the side of  the 
 rails,  but  not too close, or they will 
 be cut  down  by the  railway  janitors. 
 there  will  be  plains, and  bodies  of 
                  water.                  
                                          
 trains go by day  and  by  night.  along 
      the way, there is information       
 scattered, often put  on  top  of poles, 
 to be interpreted  by the train drivers. 
 different  parts  of  the  railway  have 
          different speed limits.         
                                          
 sometimes, trains  have to stop and wait 
 for something to happen,  far away. this 
 is  signaled  by  red  or  green lights. 
                                          
                                  
                                          
 many  people follow  the  rails by foot. 
 often  this  proves  to be  the  shorter 
 path  between  two points. however  this 
 is  frowned   upon,  and  very  impolite 
         toward the train drivers!